I have a 2004 dodge CTD with 3.73 rear end when i tow my 5ver in tow haul mode my rpm,s are runnibf 2500 rpm at 60 62 mph, sound about right? truck is a 4speed auto
With my Chevy diesel and 6 speed Allison towing our 5th wheel, at 62mph, I am running just under 1,500 rpms on level ground. This was last summer between Amarillo and Wichita Falls, Texas. With 397 hp and 762 ft lbs of torque, it doesn't have to down shift very often on the highways. My previous truck, a standard output 2002 Dodge Cummins, it would have been closer to 2,000 rpms with the 4 speed and OD tranny.